<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
        background-color: lightyellow;
    }

    h1 {
        text-align: center;
        font-size: 5em;
        color: #666666;
    }

    #box {
        column-width: 300px;
        /* column-count: 4; */
        column-gap: 20px;
    }

    img {
        width: 300px;
        /* width: 100%; */
        border: 3px inset #cccccc;
        margin-bottom: 15px;
    }
</style>

<body>
    <h1>Photo</h1>
    <div id="box">
        <img src="./1.jpg" alt="">
        <img src="./4.jpg" alt="">
        <img src="./3.jpg" alt="">
        <img src="./9.jpg" alt="">
        <img src="./5.jpg" alt="">
        <img src="./6.jpg" alt="">
        <img src="./7.jpg" alt="">
        <img src="./8.jpg" alt="">
        <img src="./2.jpg" alt="">
        <img src="./10.jpg" alt="">
        <img src="./11.jpg" alt="">
        <img src="./12.jpg" alt="">
        <img src="./13.jpg" alt="">
        <img src="./14.jpg" alt="">
        <img src="./15.jpg" alt="">
        <img src="./4.jpg" alt="">
        <img src="./1.jpg" alt="">
        <img src="./9.jpg" alt="">
        <img src="./3.jpg" alt="">
        <img src="./5.jpg" alt="">
        <img src="./6.jpg" alt="">
        <img src="./7.jpg" alt="">
        <img src="./8.jpg" alt="">
        <img src="./2.jpg" alt="">
        <img src="./10.jpg" alt="">
        <img src="./11.jpg" alt="">
        <img src="./12.jpg" alt="">
        <img src="./13.jpg" alt="">
        <img src="./14.jpg" alt="">
        <img src="./15.jpg" alt="">
    </div>
</body>

</html>